Wearable tech company Polar has expanded its range of heart rate monitoring technologies with the launch of the Polar OH1.

Polar OH1 is an optical heart rate sensor designed to be worn on the lower or upper arm. It is equipped with Polar’s advanced heart rate solution to provide accurate heart rate data without the need for a chest band.

It also features a battery life of up to 12 hours and an internal memory capable of storing up to 200 hours of HR training.

Made from a soft, machine washable fabric the armband is designed to fit snugly and discreetly around the wearer’s arm during any sports activity.

Tom Fowler, president of Polar USA says: "Polar OH1 delivers a compelling alternative to wrist and chest based heart-rate measurement. We know that comfort and accuracy are key drivers of high performance, both of which were paramount when we engineered the details of OH1.”"

Jani Juntunen, product manager at Polar, says: "The OH1 can be trusted to deliver accurate, stable data in a remarkably comfortable form factor."